二维圆形三角晶格光子晶体带隙

Bandgap of Two-dimensional Column Photonic Crystal with Triangular Lattice

利用平面波展开法计算了二维各向同性的不同介质圆柱组成的三角晶格光子晶体的带隙,并比较了以介质为背景空气圆柱组成的光子晶体和以空气为背景介质圆柱组成的光子晶体带隙的大小,发现以空气为背景的光子晶体带隙很小,而以介质为背景的光子晶体,其介电常数越大,在相同的填充率的前提下所产生的带隙就越大,带隙数目也越多。

The plane-wave expansion method is used to calculate the band structure of a two-dimensional column photonic crystal formed by a triangular lattice of different material.The bandgap of photonic crystal composed of air cylinders in different materials and material cylinders in air are compared.It is found that the larger the value of the background index is,the larger the photonic bandgap is,and the more the number of the bandgap is.